<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="jquery-1.12.4.min.js"></script>
</head>
<body>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
    <title>无标题文档</title>

    <script type="text/javascript">
        //定义全局变量
        var img_width_min = 50;
        var img_width_max = 200;
        var x_left = 0;
        var x_right = 0;
        var y_top = 0;
        var y_bottom = 0;

        //定义初始化的函数
        function init()
        {
            document.body.bgColor = "#000";
            x_right = window.innerWidth - img_width_max;
            y_bottom = window.innerHeight - img_width_max;
            //定时器
            setInterval("showStar()",100);
        }
        //显示星星
        function showStar()
        {
            //创建一个图片
            var node_img = document.createElement("img");
            //随机图片大小和随机坐标
            var width = getRandom(img_width_min,img_width_max);
            var x = getRandom(x_left,x_right);
            var y = getRandom(y_top,y_bottom);
            //增加src的属性
            node_img.setAttribute("src","./img/1.jpg");
            $('img').delay(3000).remove();
            //增加style属性
            var style = "position:absolute;left:"+x+"px;top:"+y+"px;";
            style += "width:"+width+"px;";
            node_img.setAttribute("style",style);
            //增加一个onclick事件属性
            node_img.setAttribute("onclick","removeImg(this)");
            //将图片追加到<body>元素下
            document.body.appendChild(node_img);
        }
        function removeImg(obj)
        {
            document.body.removeChild(obj);
        }
        function getRandom(min,max)
        {
            return Math.floor(Math.random()*(max-min)+min);
        }
    </script>
</head>

<body onload="init()">
</body>
</html>
</body>
</html>